It seems pretty obvious that the way you feel and think (your mindset) and your surroundings (setting) influence your perceptions and behavior. If you want to have a "good" experience, make sure your set and setting are supportive.
“Set denotes the preparation of the individual, including his personality structure and his mood at the time. Setting is physical – the weather, the room’s atmosphere; social – feelings of persons present towards one another; and cultural – prevailing views as to what is real.”[1]